Article of manufacture and process of preparing the same



E. H. HYDE July 10, 1934.

ARTICLE OF MANUFACTURE AND PROCESS OF PREPAR ING THE SAME Filed March 27, 1931 of plies have been added.

Patented July 10, 1934 UNITED s'm'nezs ARTICLE OF MANUFACTURE PROCESS OF PREPARING THE'SAME Elmer H. Hyde, Pittsburgh, Pa., assignor to American Tar Products Company, Inc., a corporation of Delaware Application March 27, 1931, Serial No. 525,!34

20 Claims. (Cl. 91-68) This invention relates to a bituminated fabricmaterial and a method of preparing the same, and more particularly to the type of fabrics used in so-called membrane-waterproofing of masonry, concrete and similar structures.

In the practice of membrane-waterproofing, a waterproof membrane is ordinarily built up by mopping the surface of the structure to be protected with a liquid bituminous material; applying to the surface thus treated an open mesh cotton fabric previously saturated with a bituminous substance; mopping the resulting surface with additional liquid bituminous material; applying another layer of a saturated fabric, and repeating this procedure till the desired number While applying the fabric, it is unwound from rolls which is the form in which it is ordinarily obtained. On account of the adhesive nature of the saturant employed in the fabric, it is very diflicult to unroll the material. This is especially the case in warm weather or when the bituminous saturant is very viscous.

' The dusting of the surface of the fabric with an inert dust such as mica, talcum, stonedust, etc., before the material is rolled, is very unsatisfactorysince the dust particles clog up the openings in the fabric and prevent proper coalescence of the moppinss with each other through the open meshes and with the saturant of the fabric.

I have found that by dusting the surfaces oi.

a saturated fabric with a pulverized high melting point bituminous material, the fabric may be easily unrolled and the penetration and coalescence of the moppings of bituminous materials are in no way interfered with.

The present invention comprises a fibrous web, preferably an open mesh cotton fabric impregnated with bituminous material and dusted with powdered bituminous matter which is compatible with the saturant and with the material employed in the moppings.

Any of the bituminous materials commonly used in membrane-waterproofing may be used for saturating the fabric, for example, natural or prepared asphalts, or pitches and bars obtained in coal distillation plants or from the manufacture of fuel gases, including water gas. Mixtures of any two or more of such bituminous materials may be used as saturants.

Pitches and asphalts are heated to maintain them in a liquid state during the saturation of the fabric. Coal tar pitch having a melting point substantially from 120 to 130 or 145 F. (cubein-water) for example, is kept well above these temperatures to insure proper penetration. A satisfactory temperature at which saturation may be carried on with bituminous saturants is from substantially-275 F. to 300 F.

pared, and pitch-coal dispersions. Powdered coal, particularly coking coals, may be used since at certain temperatures, for instance between 200 C. (392 F.) and 400 C. (752 F.), it is easily dispersible in the bituminous saturant material. The figure shown in the accompanying drawing is a diagrammatic representation of the apparatus which may be employed in preparing the product of the present invention. In preparing the product, the fabric is supplied from a. roll 1 and by means of suitable guiding rolls is passed into a saturator 2 where it is submerged in heated fluid bituminous material. The fabric is passed out of the saturator 2 and is preferably cooled bypassing it between water cooled rolls 3 and 4. From the water cooled rolls the treated fabric is passed vertically upward and downward several times to permit of proper cooling and is then dusted with pulverized bituminous material on both sides.

To accomplish this the fabric is passed over a 86 trough 5 containing pulverized bituminous material 6 and provided with a revolving brush 7. The brush picks up the bituminous material and engages a flange 8, which causes a catapulting action of the brush fibres. This action serves to 90 spatter the bituminous powder onto the fabric.

The fabric thus treated on one side passes around a roll 9 and over a second dusting trough 10 having a brush 11 similar to the brush '7. In

this manner the powdered bituminous material is p uniformly and continuously distributed on both sides of the fabric. The treated fabric may now be passed over or between any desired number of rolls to force the bituminous dust into the surface of the fabric. When finished it is passed present invention: Cotton fabric having approximately 30 threads to the inch and weighing approximately 4 yards to the pound (width 36") is saturated with a binder consisting preferably of a mixture of about 85% of tar with about 15% Mexican asphalt, the said binder having a float test of 450 seconds at 22 0. The fabric passed through the saturant heated to aboutwhen 275 F. absorbs the saturant to the extent about twice its own weight.

The saturated fabric, preferably after cooling, is dusted with pulverized coal tar pitch having a melting'point of approximately-150 C. (300 F.)

(cube-in-air method). The pitch is ground so that about passes through a 200 mesh screen.-

The amount of powder applied to each side of the fabric is equal to about 10% of the weight of.

scribed above, the bituminous moppings'flux and coalesce readily with the bituminousmatteron the fabric.

I claim as my invention:

1. An article of manufacture consisting of a fibrous web impregnated with bituminous mate- 'rial, and individual particles of pulverized solid bituminous material adhering to the said web.

2. An article of manufacture consisting of a fibrous web impregnated with fluid bituminous material, and individual particles of pulverized solid bituminous material of relatively high melting point adhering to the said impregnated web. 3. An article of manufacture consisting-of a fibrous web impregnated with bituminous material, and individual solid particles of pulverized hard pitch adhering to the said impregnated web.

4. An article of manufacture consisting of an open mesh fabric impregnated with bituminous material and a coating of pulverized solid hard pitch on strands of the said fabric.

. 5. An article of manufacture consisting of -an open mesh fabric impregnated with bituminous material and a coating of pulverized solid hard asphalt on strands of the said fabric.

8. An article of manufacture consisting of an open mesh fabric impregnated with bituminous material and a coating on strands of the said fabric of pulverized materialcomp'rising a solid dispersion of:coal in bituminous matter. '7. An article of manufacture consisting of-an open mesh fabric saturated with a mixture containing tar and asphalt, and individual particles of pulverized solid coal tar pitch adhering to the said fabric.

8. An article ofmanufacture compris an open mesh fabric saturated with a composition comprising about tar and about 15% asphalt,

the said composition having a float test of about 450 seconds at 32 0., and pulverized coal tar pitch adhering to the said fabric.

9. An article of manufacture comprising an open mesh fabric saturated with a composition comprising about 85% tar and about 15% asp'halt, the said composition having a float test 5 of about 450 seconds at 32 C., and pulverized hard pitch adhering to the said fabric.

10. An article of manufacture comprising an a open mesh fabric impregnated with bituminous material and having a coating of solid pitch particles adhering to impregnated strands of the said fabric, the openings in the said fabric being free from inert dust which tends to prevent coales- I cence and penetration through said openings, of liquid bituminous material subsequently applied to the surfaces of the bituminated fabric.

13. An article of manufacture for use in membrane-waterproofing of masonry, concrete and similar construction materials, the said article consisting of an open mesh fabric impregnated with bituminous material, and finely divided solid pitch particles adhering to and distributed on the surface of the impregnated fabric.

14. A process comprising saturating afibrous open mesh web with hot fluid bituminous material, cooling the saturated web, and distributing solid particles consisting of bituminousmatter on the surface of the bituminated web to coat strands'thereof with said particles.

15. An article of manufacture comprising a fibrous web having loosely wovenstrands impregnated with bituminous material, particles of pulverized, solid bituminous material adhering to the web, the bituminated web product having open meshes.

16. An article of manufacture comprising a loosely woven web having particles of pulverized. solid bituminous materlal adhering to the web, the coated web product having open meshes.

17. A process comprising saturating a fibrous open mesh web with fluid bituminous material, and distributing solid particles of pulverized bitu minous matter on-the surface of the saturated web.

13. A process comprising satin'ating a fibrous open mesh web with fluid bituminous material, distributing on the saturated web solid particles of pulverized bituminous matter and thereby coating the strands but leaving meshes open.

19. An article of manufacture comprising a fibrous webhaving loosely woven strands impregnated with a. saturant containing tar and asphalt; and individual particles of pulverized solid asphalt on the surface of said impregnated strands.

20. An article of manufacture comprising a fibrous web having loosely woven strands impregnated with a saturant containing tar and asphalt: and individual particles .of pulverized solid bituminous material on the surface of said impregnated strands.

ELMER 11;.HYDE. 

